ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

Home Browse Search

sound attenuation features such as generator housing structures. Pumping station sites would typically be one- quarter acre or less. Interim and permanent pumping stations would be designed for service lives of 10 and 50 years respectively(Richard,pers. comm.,2006b). The proposed project would construct three large diameter trunk sewers to collect wastewater from the north, central, and south sections of the City(Exhibit 3-3). The north and south trunk sewers would collect flow from areas where future growth is expected,while the central trunk sewer would connect the existing collection system to the north trunk sewer. The proposed north trunk sewer would include 40 sewer segments that are 18-60 inches in diameter,while the south trunk sewer would include 50 sewer segments that are 8-60 inches in diameter. Measuring 6,442 feet(approximately 1.22 miles),the central trunk sewer would include 12 sewer segments that are 36 inches in diameter, and would eliminate the need for the existing Union Road pump station(City of Manteca 2006). The proposed project also includes several minor improvements to existing sewer lines. Hydraulic modeling and a review of historical records found no major deficiencies in the existing collection system;however, several minor problems were identified, including pipeline obstructions and miscellaneous flow problems. To address these problems,the proposed project includes a total of 11 collection system improvement projects, such as rehabilitating manholes and eliminating sagging pipelines. These improvements would generally be located within the existing collection system network. 3.7.4 CONSTRUCTION Construction of the proposed WQCF and Collection System Master Plan project would require approximately 80 construction personnel(30 for WQCF improvements, 30 for trunk sewer construction, and 20 for pump station construction). The precise number of construction workers would depend on the type of facilities being constructed,the number of simultaneous construction jobs, and the construction schedule. In general, construction activities for the WQCF,wastewater collection system, and recycled water distribution system would include site preparation, grading, excavation,trenching,backfilling,building construction, and pipeline installation. Equipment typically used for construction activities includes scrapers, earthmovers, dozers, cranes, compacters, graders, dump trucks, delivery trucks, loaders, and jackhammers. The quantities of each type of construction equipment would vary depending on the type of facility being constructed. On average, approximately 60 employee vehicle round trips per day and approximately 10 construction-related truck round trips per day would be required during WQCF and Collection System Master Plan project construction. Both the interim and permanent pumping stations would be predominantly below grade, and construction of each station would likely occur over an 18-month period. Collection system and outfall pipeline would be constructed in 12-foot segments, and construction would typically occur within a 25-foot wide corridor in public right-of-way within either existing or future paved streets. 3.7.5 OPERATIONS STAFFING The expanded WQCF would continue to be operated by City personnel.As required by law, operators are licensed by the State Water Resources Control Board(SWRCB). Typical WQCF operation involves flow routing; starting, stopping and adjusting pumps,blowers and other equipment;hosing down basins and equipment;reading flow meters and taking water samples for testing;performing laboratory tests and documenting results; and maintaining and repairing equipment. Currently, staffing at the WQCF consists of approximately 23 people, including supervisors, operators, laboratory personnel, and maintenance staff. Because the WQCF operates 24 Manteca WQCF and Collection System Master Plans EIR EDAW City of Manteca 3-23 Project Description